红层软岩微观结构与抗剪强度关系实验分析

现代地质 ›› 2013, Vol. 27 ›› Issue (3): 738-742.

红层软岩微观结构与抗剪强度关系实验分析

王迎春，陈剑

中国地质大学工程技术学院，北京100083

收稿日期:2012-04-16 修回日期:2013-04-22 出版日期:2013-06-07 发布日期:2013-06-08
通讯作者: 陈剑，男，副教授，1975年出生，地质工程专业，主要从事工程地质、岩石力学与地质灾害防治等方面的科研与教学工作。
作者简介:王迎春,男，本科生，1989年出生，勘查技术与工程专业，主要从事工程地质研究。Email：jianchen@cugb.edu.cn。
基金资助:
国家自然科学基金青年科学基金项目（40901005）;中央高校基本科研业务费资助项目（2011YXL054）;中国地质大学(北京)大学生创新性实验计划项目（2011CXY033）。

Preliminary Research on the Relationship Between Microscopic Structure and Shear Strength of Red-bed Soft Rocks

WANG Ying-chun， CHEN Jian

School of Engineering and Technology，China University of Geosciences, Beijing100083, China

Received:2012-04-16 Revised:2013-04-22 Online:2013-06-07 Published:2013-06-08

摘要/Abstract

摘要：

红层软岩属于滑坡、崩塌灾害的易发地层，岩石的微观结构特性对其宏观力学强度有着重要影响。对四川省屏山县和云南省绥江县采集的侏罗系红层砂岩、粉砂岩和泥岩样品进行了扫描电镜观察及变角模抗剪强度实验。基于MATLAB数字图像处理技术，提取了红层砂岩、粉砂岩和泥岩的微观结构参量，即孔隙率、颗粒磨圆度、颗粒定向度及欧拉数的量化值，进一步分析了上述各参量和抗剪强度的定量关系。研究结果表明：红层软岩的抗剪强度和孔隙率呈负指数关系，和颗粒磨圆度、定向度呈负相关线性关系，和欧拉数呈正相关线性关系。

关键词: 红层软岩, 抗剪强度, 数字图像, 微观结构, 相关性

Abstract:

Red-bed soft rocks belong to the layers which are susceptible to landslide and collapse. The micro-structural characteristics of the rock have an important impact on its macroscopic mechanical strength. In this paper, the micro-structural observation with scanning electron microscopy (SEM) and the angle-changed shear strength test of the Jurassic red-bed sandstone, siltstone and mudstone samples which were collected from Pingshan County in Sichuan Province and Suijiang County in Yunnan Province were conducted. A large number of microstructures of red-bed sandstone, siltstone and mudstone were analyzed and the shear strength values of the red-bed soft rocks were obtained. The microstructure parameters, i.e.porosity, particle roundness, particle orientation and the quantized value of Euler number of the red-bed sandstone, siltstone and mudstone were extracted based on MATLAB digital image processing techniques. Then the quantitative relationship between the above parameters and the shear strength were analyzed. The results show that the shear strength and porosity of the red-bed soft rock have a negative exponential relationship; the shear strength and particle roundness and particle orientation have a negative linear relationship; the shear strength and the Euler number have positively correlated linear relationship.

Key words: red-bed soft rock, shear strength, digital image, microstructure, correlation

中图分类号:

P642.2

王迎春，陈剑. 红层软岩微观结构与抗剪强度关系实验分析[J]. 现代地质, 2013, 27(3): 738-742.

WANG Ying-chun， CHEN Jian. Preliminary Research on the Relationship Between Microscopic Structure and Shear Strength of Red-bed Soft Rocks[J]. Geoscience, 2013, 27(3): 738-742.

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